I checked the archives for helpful hints on controling feedback but aside from the mention of a noise gate, I did not find anything that would solve my problem. I am aware of the inherent difficulties with high impedence microphones and old tube amps but I thought if I described my rig, someone on the list may have a suggestion.
I am currently playing with a SURE silver bullet microphone (late 50's) which I believe has a controlled reluctance element. My amp is a 1970 Fender Super Reverb (original parts and speakers). I have the Mid and Treble at about 5.5 and the Bass at 10, Reverb at 3.25 and speed and intensity at 0. I can only turn my volume to about 3 before I start encountering feedback problems. I have played with traditional blues bands in the past and this was more than enough volume, but I am playing with some college students now who like it loud, REAL LOUD. Our guitarist suggests that I mic my amp, but the whole reason I payed big bucks for the Super is to avoid having to mic it. I have tried positioning the amp in different areas when we play and also have experimented with my own position relative to the amp - nothing seems to help. Any suggestions?